Question

A billiard ball, A, with unknown mass, travels horizontally at ?? = 2.50 m/s when it strikes another billiard ball, B, with the same mass, sitting at the edge of a table which is ℎ = 0.800 m high. Assume that the collision of the two billiard balls is perfectly elastic. Calculate the horizontal distance billiard ball B travels from the edge of the table until it hits the ground.

Answer 1

It's a horizontal projectile where the initial vertical speed =0 and the horizontal initial speed = 2.5 m/s

Also in elastic motion of two ball have same mass then their velocities interchange after the collision.

also the time elapsed along y axis will be equal to the time along x axis by the ball